.mask{
	width: 100%;
	height: 100%;
	background: rgba(0,0,0,0.5);
	position: fixed;
	top: 0;
	left: 0;
	display: none;
}
.box{
	width: 500px;
	height: 500px;
	margin: 200px auto;
	background: aliceblue;
	position: relative;
}
.box>.close{
	width: 30px;
	height: 25px;
	text-align: center;
	line-height: 30px;
	position: absolute;
	top: 0;
	right: 0;
}
.box>.close:hover{
	background: red;
	cursor: pointer;
}
#Form{
	width: 180px;
	height: 100px;
	background: yellowgreen;
	margin: 10px auto;
	position: relative;
}
.maskShow{
	display: block;
}